Battery pack, heat exchange device and heat exchange method of battery pack and vehicle

Abstract

The invention provides a battery pack, a heat exchange device and a heat exchange method of the battery pack and a vehicle, and the heat exchange device of the battery pack comprises a first heat exchange pipeline which comprises a first heat exchange section, and one side of the first heat exchange section is used for being in contact fit with a battery cell; the heat dissipation fins are in contact fit with the other side of the first heat exchange section; and the first switch structure and the first pumping structure are arranged on the first heat exchange pipeline. According to the technical scheme, combined cooling of liquid cooling and air cooling of the battery pack can be achieved, and the cooling effect is greatly improved. And under the condition of the same thermal load, compared with a single liquid cooling mode, the liquid cooling and air cooling combined cooling mode can maintain the performance of the battery by adopting less energy, so that the energy consumption of the whole vehicle is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery pack, a heat exchange device and a heat exchange method for the battery pack, and a vehicle. Background Art

[0002] The battery pack is the core component of new energy vehicles. During the driving process of the vehicle, the battery pack needs to be kept in a suitable temperature range to perform well. In the existing technology, air cooling or liquid cooling is usually used alone to exchange heat for the battery, but both of these heat exchange methods have certain limitations.

[0003] First of all, the air cooling system can only cool the battery pack, and the airflow usually adopts high-speed convection flowing through the bottom of the vehicle while the car is driving. Therefore, the cooling degree of the battery pack is difficult to control, which can easily cause overcooling of the battery pack and affect battery performance.

[0004] Secondly, the liquid cooling system achieves heat exchange with the battery pack by flowing coolant through the battery pack. By controlling the flow and temperature of the coolant, the degree of cooling or heating of the battery pack can be controlled. However, the liquid cooling system needs to drive the coolant to circulate continuously through a power source (water pump or compressor), which will increase the energy consumption of the vehicle and reduce the vehicle's endurance. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the air cooling system of the battery pack in the prior art that the heat exchange degree is difficult to control and the liquid cooling system increases the energy consumption of the vehicle, thereby providing a battery pack, a heat exchange device and heat exchange method of the battery pack and a vehicle.

[0006] In order to solve the above problems, the present invention provides a heat exchange device for a battery pack, comprising: a first heat exchange pipeline, including a first heat exchange section, one side of the first heat exchange section is used to contact and cooperate with the battery cell; a heat dissipation fin, contacting and cooperating with the other side of the first heat exchange section; a first switch structure and a first pumping structure, which are arranged on the first heat exchange pipeline.

[0007] Optionally, the first switch structure is located at an upstream position of the first heat exchange section, and the first pumping structure is located at a downstream position of the first heat exchange section.

[0008] Optionally, a heat insulation layer is also included, which is coated outside the first heat exchange section and is in contact with the battery core.

[0009] Optionally, the first heat exchange section includes a plurality of first branch pipes arranged in parallel, and at least some of the first branch pipes are provided with heat dissipation fins.

[0010] Optionally, the first heat exchange section is made of plastic material.

[0011] The present invention also provides a battery pack, comprising: a battery cell; a first heat exchange device, arranged on the first surface of the battery cell, the first heat exchange device includes the above-mentioned heat exchange device; a second heat exchange device, arranged on the second surface of the battery cell, the second heat exchange device includes a second heat exchange pipeline, a second switch structure and a second pumping structure, the second heat exchange pipeline includes a second heat exchange section, the second heat exchange section is used to contact and cooperate with the battery cell, the second switch structure and the second pumping structure are both arranged on the second heat exchange pipeline, the second switch structure is located at the upstream position of the second heat exchange section, and the second pumping structure is located at the downstream position of the second heat exchange section.

[0012] Optionally, the first surface is a surface of the battery cell facing the outside of the vehicle, and the second surface is a surface of the battery cell facing the inside of the vehicle.

[0013] Optionally, the battery pack also includes a medium inlet pipe and a medium outlet pipe, the upstream end of the first heat exchange pipeline and the upstream end of the second heat exchange pipeline are both connected to the medium inlet pipe, and the downstream end of the first heat exchange pipeline and the downstream end of the second heat exchange pipeline are both connected to the medium outlet pipe.

[0014] The present invention also provides a heat exchange method for a battery pack, the battery pack is the battery pack mentioned above, and the heat exchange method includes: judging whether the battery cell needs to be cooled or heated; if it is judged that the battery cell needs to be cooled, closing the second switch structure and the second pumping structure, opening the first switch structure, and starting the first pumping structure to allow the heat exchange medium to enter the first heat exchange section; if it is judged that the battery cell needs to be heated, closing the first switch structure, starting the first pumping structure to form a vacuum in the first heat exchange section, opening the second switch structure, and starting the second pumping structure to allow the heat exchange medium to enter the second heat exchange section.

[0015] Optionally, determining whether the battery cell needs to be cooled or heated includes: obtaining the ambient temperature; if the ambient temperature is greater than a first preset value, determining that the battery cell needs to be cooled; if the ambient temperature is less than a second preset value, determining that the battery cell needs to be heated.

[0016] Optionally, determining whether the battery cell needs to be cooled or heated also includes: if the ambient temperature is greater than a first preset value and an instruction is received from the occupant to cool the battery pack, determining that the battery cell needs to be cooled; if the ambient temperature is less than a second preset value and an instruction is received from the occupant to heat the battery pack, determining that the battery cell needs to be heated.

[0017] Optionally, if it is determined that the battery cell needs to be cooled, the second switch structure and the second pumping structure are closed, the first switch structure is opened, and the first pumping structure is started to allow the heat exchange medium to enter the first heat exchange section, including: obtaining the battery cell temperature; if the ambient temperature is greater than the first preset value, and the battery cell temperature is less than the third preset value, after the heat exchange medium fills the first heat exchange section, the first switch structure is closed, and the first pumping structure is closed.

[0018] Optionally, if it is determined that the battery cell needs to be cooled, the second switch structure and the second pumping structure are closed, the first switch structure is opened, and the first pumping structure is started to allow the heat exchange medium to enter the first heat exchange section. The method also includes: if the ambient temperature is greater than a first preset value, and the battery cell temperature is greater than a third preset value, the first switch structure is opened, and the first pumping structure is started to allow the heat exchange medium to continue to flow through the first heat exchange section.

[0019] Optionally, if it is determined that the battery cell needs to be heated, the first switch structure is closed, the first pumping structure is started to form a vacuum in the first heat exchange section, the second switch structure is opened, and the second pumping structure is started to allow the heat exchange medium to enter the second heat exchange section, including: obtaining the battery cell temperature; if the ambient temperature is less than the second preset value and the battery cell temperature is greater than the fourth preset value, the second pumping structure is closed after the heat exchange medium fills the second heat exchange section.

[0020] Optionally, if it is determined that the battery cell needs to be heated, the first switch structure is closed, the first pumping structure is started to form a vacuum in the first heat exchange section, the second switch structure is opened, and the second pumping structure is started to allow the heat exchange medium to enter the second heat exchange section. The method also includes: if the ambient temperature is less than the second preset value and the battery cell temperature is less than the fourth preset value, the second pumping structure is opened to allow the heat exchange medium to continue to flow through the second heat exchange section.

[0021] The present invention also provides a vehicle, comprising the above-mentioned battery pack.

[0022] The present invention has the following advantages:

[0023] By using the technical solution of the present invention, when there is no heat exchange demand for the battery cells of the battery pack, the first switch structure closes the first heat exchange pipeline, and the first pumping structure evacuates the first heat exchange section, so that the battery pack is isolated from the heat sink fins. When there is a lower heat exchange demand for the battery cells of the battery pack, the first switch structure opens the first heat exchange pipeline, and the first pumping structure fills the heat exchange medium into the first heat exchange section, so that the battery pack can achieve heat transfer with the heat sink fins through the heat exchange medium, and the battery pack can achieve air cooling. When there is a higher heat exchange demand for the battery cells of the battery pack, the first pumping structure is continuously turned on, so that the cooling medium circulates through the first heat exchange section, and the battery cells of the battery pack can achieve a combination of liquid cooling and air cooling, greatly improving the cooling effect. And under the same heat load, the combined cooling method of liquid cooling and air cooling can use less energy to maintain battery performance compared to the single liquid cooling method, thereby reducing the energy consumption of the entire vehicle. Therefore, the technical solution of the present invention solves the defects in the prior art that the heat exchange degree of the air cooling system of the battery pack is difficult to control and the liquid cooling system increases the energy consumption of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of a battery pack heat exchange device according to the present invention is shown;

[0026] Figure 2 A schematic diagram showing the structure of the battery pack of the present invention is shown;

[0027] Figure 3 A schematic flow chart of a heat exchange method for a battery pack of the present invention is shown;

[0028] Figure 4 Shows Figure 3 A further flow chart of step S10 in FIG.

[0029] Figure 5 Shows Figure 4 A further flow chart of step S10 in FIG.

[0030] Figure 6 Shows Figure 3 A further flow chart of step S20;

[0031] Figure 7 Shows Figure 3 A further flowchart of step S30 is shown in FIG.

[0032] Description of reference numerals:

[0033] 10. First heat exchange pipeline; 11. First heat exchange section; 111. First branch pipe; 20. Heat dissipation fins; 30. First switch structure; 40. First pumping structure; 50. Heat insulation layer; 100. Battery core; 101. First surface; 102. Second surface; 200. First heat exchange device; 300. Second heat exchange device; 301. Second heat exchange pipeline; 3011. Second heat exchange section; 302. Second switch structure; 303. Second pumping structure; 400. Medium inlet pipe; 500. Medium outlet pipe. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 and Figure 2 As shown, an embodiment of the heat exchange device of the battery pack according to the present application includes a first heat exchange pipeline 10, a heat dissipation fin 20, a first switch structure 30 and a first pumping structure 40. Among them, the battery pack includes a battery cell 100. The first heat exchange pipeline 10 includes a first heat exchange section 11, and one side of the first heat exchange section 11 is used to contact and cooperate with the battery cell 100. The heat dissipation fin 20 contacts and cooperates with the other side of the first heat exchange section 11. The first switch structure 30 and the first pumping structure 40 are both arranged on the first heat exchange pipeline 10, the first switch structure 30 is located at the upstream position of the first heat exchange section 11, and the first pumping structure 40 is located at the downstream position of the first heat exchange section 11.

[0039] By using the technical solution of this embodiment, when there is no heat exchange demand for the battery cell 100 of the battery pack, the first switch structure 30 closes the first heat exchange pipeline 10, and the first pumping structure 40 evacuates the first heat exchange section 11, so that the battery pack is isolated from the heat sink fins 20. When there is a lower heat exchange demand for the battery cell 100 of the battery pack, the first switch structure 30 opens the first heat exchange pipeline, and the first pumping structure 40 fills the heat exchange medium into the first heat exchange section 11, so that the battery cell 100 of the battery pack can achieve heat transfer with the heat sink fins 20 through the heat exchange medium, and the battery pack can achieve air cooling. When there is a higher heat exchange demand for the battery cell 100 of the battery pack, the first pumping structure 40 is continuously opened, so that the cooling medium circulates through the first heat exchange section 11, and the battery pack can achieve a combination of liquid cooling and air cooling, greatly improving the cooling effect. Moreover, under the same heat load, the combined cooling method of liquid cooling and air cooling can maintain battery performance with less energy than the cooling method of liquid cooling alone, thereby reducing the energy consumption of the entire vehicle. Therefore, the technical solution of this embodiment solves the defects of the air cooling system of the battery pack in the prior art that the heat exchange degree is difficult to control and the liquid cooling system increases the energy consumption of the vehicle.

[0040] The heat exchange device in this embodiment is mainly used to cool down the battery cells 100 of the battery pack.

[0041] It should be noted that Figure 1 In the content shown, the circular tube in the lower dotted frame shows the range of the first heat exchange section 11. Figure 2 In the content shown, the dotted line in the lower dotted line frame shows the range of the first heat exchange section 11. Figure 1 and Figure 2 As shown, the first heat exchange pipeline 10 is used to pass heat exchange medium, wherein the first heat exchange pipeline 10 includes a first heat exchange section 11, and one side of the first heat exchange section 11 is used to contact and cooperate with the battery cell 100 of the battery pack. Therefore, when the heat exchange medium is in the first heat exchange section 11, heat exchange with the battery cell 100 can be achieved.

[0042] from Figure 1 It can be seen that the other side of the first heat exchange section 11 is connected to the heat dissipation fins 20 . When the airflow blows through the heat dissipation fins 20 , the heat of the heat dissipation fins 20 can be taken away, thereby reducing the temperature of the heat dissipation fins 20 .

[0043] It should be noted that Figure 1The upper side of the first heat exchange section 11 is in contact with the battery cell 100, and the lower side of the first heat exchange section 11 is provided with a heat dissipation fin 20. Therefore, the above-mentioned "one side" and "the other side" in this embodiment are two sides arranged at 180° in the circumferential direction of the first heat exchange section 11. In some embodiments not shown, those skilled in the art can adjust the angles of the above-mentioned "one side" and "the other side" in the circumferential direction of the first heat exchange section 11 according to actual needs (assembly space, layout design, etc.), for example, adjusting the two to 160°, 140°, 100°, 90°, etc. in the circumferential direction.

[0044] Furthermore, a first switch structure 30 and a first pumping structure 40 are also provided on the first heat exchange pipeline 10 . The first switch structure 30 is located upstream of the first heat exchange section 11 , and the first pumping structure 40 is located downstream of the first heat exchange section 11 .

[0045] In some embodiments not shown, the positions of the first switch structure 30 and the first pumping structure 40 can be flexibly adjusted by those skilled in the art, and are not limited to the above positions. As long as the first switch structure 30 can open or close the first heat exchange section 11, and the first pumping structure 40 can fill the heat exchange medium into the first heat exchange section 11, or evacuate the first heat exchange section 11, it will be sufficient.

[0046] by Figure 2 The direction shown is used for explanation. In this embodiment, the flow direction of the heat exchange medium is from left to right. Therefore, the first switch structure 30 is arranged on the left side of the first heat exchange section 11, and the first pumping structure 40 is arranged on the right side of the first heat exchange section 11.

[0047] Furthermore, the first switch structure 30 can open or close the first heat exchange pipeline 10, and the first switch structure 30 can be a valve, a reversing valve, etc.

[0048] Furthermore, the first pumping structure 40 can provide a negative pressure driving force and drive the heat exchange medium to flow from the upstream to the downstream of the first heat exchange pipeline 10. The first pumping structure 40 can be a water pump.

[0049] According to the above structure, the heat exchange device of the battery pack of this embodiment has the following three working states:

[0050] State 1: The first switch structure 30 is closed, and the first pumping structure 40 is started. Since the first switch structure 30 is closed, the heat exchange medium cannot enter the first heat exchange section 11. After the first pumping structure 40 is started, the first heat exchange section 11 is evacuated. Since the first heat exchange section 11 is a vacuum environment, the heat of the battery cell 100 cannot be transferred to the heat sink fins 20 through the first heat exchange section 11. That is, the battery cell 100 and the heat sink fins 20 are thermally isolated.

[0051] In state one, after the first heat exchange section 11 is evacuated, the first pumping structure 40 can be operated continuously, thereby ensuring that the first heat exchange section 11 is continuously in a vacuum state. In an embodiment not shown, a switch structure can be added near the upstream or downstream of the first pumping structure 40 of the first heat exchange pipeline 10. After the first heat exchange section 11 is evacuated, the switch structure is closed, so that the first heat exchange section 11 is continuously in a vacuum state. At this time, the first pumping structure 40 can be closed, thereby further reducing the energy consumption of the whole vehicle. Alternatively, if the first pumping structure 40 has the function of automatically isolating the air inlet and the air outlet when closed, the first pumping structure 40 can be directly closed after the first heat exchange section 11 is evacuated.

[0052] Optionally, a vacuum gauge may be provided in the first heat exchange section 11, and the vacuum gauge may detect the vacuum degree in the first heat exchange section 11. After working for a period of time, there may be a pressure leak in the first heat exchange section 11. If the vacuum degree detected by the vacuum gauge does not meet the requirement, the first pumping structure 40 may be operated for a period of time to make the vacuum degree in the first heat exchange section 11 meet the requirement again, and then the first pumping structure 40 may be closed.

[0053] State 2: First, the first switch structure 30 is opened, and the first pumping structure 40 is operated, so that the heat exchange medium is filled into the first heat exchange section 11. When the first heat exchange section 11 is filled with the heat exchange medium, the first switch structure 30 is closed, and the first pumping structure 40 is closed, that is, the heat exchange medium is statically filled into the first heat exchange section 11.

[0054] In state 2, the heat of the battery cell 100 can be transferred to the heat exchange medium, and the heat of the heat exchange medium can be transferred to the heat dissipation fins 20, that is, the battery cell 100 and the heat dissipation fins 20 are thermally connected. When air flows through the heat dissipation fins 20, air cooling of the battery cell 100 can be achieved.

[0055] State three: the first switch structure 30 is continuously opened, and the first pumping structure 40 is continuously started, and at this time, the heat exchange medium continuously flows through the first heat exchange section 11 .

[0056] In state three, on the one hand, the battery cell 100 and the heat dissipation fins 20 are thermally connected through the heat exchange medium, and on the other hand, the continuously flowing heat exchange medium can continuously take away the heat of the battery cell 100, thereby realizing the dual-source heat exchange (air cooling plus liquid cooling) function of liquid cooling and air cooling of the battery cell 100.

[0057] For the sake of convenience and simplification of description, the above-mentioned "state one", "state two" and "state three" are used below to represent the various working states of the heat exchange device of this embodiment, and the switching process of the first switch structure 30 and the first pumping structure 40 is no longer repeated.

[0058] The corresponding relationship between the heat exchange requirements of the battery cell 100 and the above-mentioned states is introduced below.

[0059] When the battery cell 100 has no need to be cooled, the heat exchange device switches to state 1, and most of the heat of the battery cell 100 will not be transferred to the heat dissipation fins 20, thereby preventing high-speed airflow from passing through the heat dissipation fins 20 and causing excessive cooling of the battery cell 100, thereby avoiding the situation where the temperature of the battery cell 100 is too low to affect the working performance.

[0060] When the battery cell 100 has a lower cooling requirement, the heat exchange device switches to state 2. At this time, the heat dissipation requirement of the battery cell 100 can be met only by air cooling, and the first pumping structure 40 hardly needs to work, thereby reducing energy consumption and improving vehicle endurance.

[0061] When the battery cell 100 has a high cooling demand, the heat exchange device switches to state three, using air cooling and liquid cooling dual-source heat exchange to achieve strong cooling of the battery cell 100. And under the same heat load, the combined cooling method of air cooling and liquid cooling can use less energy to maintain battery performance compared to the single liquid cooling method, thereby reducing the energy consumption of the entire vehicle.

[0062] like Figure 1 As shown, in the technical solution of this embodiment, a heat insulation layer 50 is further included. The heat insulation layer 50 is coated outside the first heat exchange section 11 , and the heat insulation layer 50 is in contact with the battery core 100 .

[0063] Specifically, the heat insulation layer 50 is a layered structure, which is disposed on the surface of the battery cell 100. Figure 1 It can be seen that the heat insulation layer 50 is wrapped around the first heat exchange section 11. Such a configuration can prevent the heat of the battery cell 100 from being transferred to the heat dissipation fins 20 along the outer space of the first heat exchange section 11 when the heat exchange device is in the above state, thereby making the thermal isolation effect between the battery cell 100 and the heat dissipation fins 20 better.

[0064] Optionally, the heat insulating layer 50 may be made of a material with a low thermal conductivity so as to isolate heat transfer. For example, the material of the heat insulating layer 50 may include foam.

[0065] like Figure 1 As shown, in the technical solution of this embodiment, the first heat exchange section 11 includes a plurality of first branch pipes 111 arranged in parallel, and heat dissipation fins 20 are arranged at at least some of the first branch pipes 111 .

[0066] Specifically, since the surface area of ​​the battery cell 100 is usually large (especially the upper and lower surfaces), it is necessary to set up multiple first heat exchange sections 11 to cover the surface of the battery cell 100. Multiple first heat exchange sections 11 are arranged in parallel, and multiple first heat exchange sections 11 are connected to the upstream part of the first branch pipe 111, and multiple first heat exchange sections 11 are also connected to the downstream part of the first branch pipe 111. Therefore, when the first switch structure 30 is closed, the heat exchange medium cannot flow into the multiple first heat exchange sections 11, and when the first switch structure 30 is opened, the heat exchange medium can flow into the multiple first heat exchange sections 11. When the first pumping structure 40 is started, the heat exchange medium can be driven to flow through the multiple first heat exchange sections 11, or, when the first pumping structure 40 is started, a vacuum environment can be formed in the multiple first heat exchange sections 11.

[0067] from Figure 1 It can be seen that the above-mentioned heat insulation layer 50 also fills the portion between the adjacent first heat exchange sections 11 , thereby further improving the thermal isolation effect between the first heat exchange sections 11 and the heat dissipation fins 20 .

[0068] from Figure 1 It can be seen that each first heat exchange section 11 is correspondingly provided with a heat dissipation fin 20. Of course, in some embodiments not shown, among the plurality of first heat exchange sections 11, heat dissipation fins 20 may also be provided only on part of the first heat exchange sections 11.

[0069] Optionally, the first heat exchange section 11 is made of plastic material. Plastic has a low thermal conductivity, so when the heat exchange device is in the above-mentioned state 1, the heat of the battery cell 100 can be reduced as much as possible from being transferred along the tube wall of the first heat exchange section 11 to the heat dissipation fins 20, thereby achieving a better thermal isolation effect between the battery cell 100 and the heat dissipation fins 20.

[0070] Of course, the first heat exchange section 11 may also be made of other materials.

[0071] like Figure 1 and Figure 2 As shown, the present application also provides a battery pack. According to an embodiment of the battery pack of the present application, the battery pack includes a battery cell 100 , a first heat exchange device 200 , and a second heat exchange device 300 .

[0072] Specifically, the battery pack also includes an outer shell, which basically includes a lower shell and an upper shell that are interlocked with each other, and the lower shell and the upper shell enclose a storage space, in which an electrical compartment and a battery compartment are formed, electrical components are placed in the electrical compartment, and battery cells 100 are placed in the battery compartment, and the battery cells 100 form a battery pack.

[0073] Further, the first heat exchange device 200 is disposed on the first surface 101 of the battery cell 100 , and the first heat exchange device 200 is the above-mentioned heat exchange device. In this embodiment, the first heat exchange device 200 is used to cool down the battery cell 100 .

[0074] Further, the second heat exchange device 300 is arranged on the second surface 102 of the battery cell 100, and the second heat exchange device 300 includes a second heat exchange pipeline 301, a second switch structure 302 and a second pumping structure 303. The second heat exchange pipeline 301 includes a second heat exchange section 3011, and the second heat exchange section 3011 is used to contact and cooperate with the battery cell 100. The second switch structure 302 and the second pumping structure 303 are both arranged on the second heat exchange pipeline 301, and the second switch structure 302 is located at the upstream position of the second heat exchange section 3011, and the second pumping structure 303 is located at the downstream position of the second heat exchange section 3011. In this embodiment, the second heat exchange device is used to heat the battery cell 100.

[0075] It should be noted that Figure 1 In the content shown, the circular tube in the upper dotted frame shows the range of the second heat exchange section 3011. Figure 2 In the content shown, the dotted line in the upper dotted line frame shows the range of the second heat exchange section 3011.

[0076] Combination Figure 1 and Figure 2 It can be seen that the second heat exchange device 300 has a substantially similar structure to the first heat exchange device 200, except that since the second heat exchange device 300 is used to heat the battery cell 100, it is not necessary to provide heat dissipation fins on the second heat exchange section 3011. Apart from this difference, the structure and basic working principle of the second heat exchange device 300 can refer to the above-mentioned embodiment of the heat exchange device, so it will not be described in detail.

[0077] Furthermore, when the second heat exchange device 300 heats the battery cell 100 , it has the following two working states.

[0078] State 4: The second switch structure 302 is turned on, and the second pumping structure 303 is started, so that the heat exchange medium flows into the second heat exchange section 3011. After the heat exchange medium is filled into the second heat exchange section 3011, the second pumping structure 303 is turned off, and the heat of the heat exchange medium can be transferred to the battery cell 100, thereby heating the battery cell. At the same time, the heat of the heat exchange medium upstream of the second heat exchange pipeline 301 can be conducted to supplement the heat exchange medium in the second heat exchange section 3011, thereby continuously heating the battery cell 100.

[0079] State five: the second switch structure 302 is turned on, and the second pumping structure 303 is continuously started, so that the heat exchange medium can continuously flow through the battery cell 100 to transfer heat to the battery cell 100 , thereby further enhancing the heating effect on the battery cell 100 .

[0080] For the sake of convenience and simplification of description, the above-mentioned “state four” and “state five” are used below to represent the various working states of the second heat exchange device 300 of this embodiment, and the switching process of the second switch structure 302 and the second pumping structure 303 is not repeated.

[0081] The following describes the corresponding relationship between the heating requirements of the battery pack and the above-mentioned states.

[0082] When the battery cell 100 has a lower heating requirement, the second heat exchange device 300 switches to state four to heat the battery cell 100 .

[0083] When the battery cell 100 has a higher heating demand, the second heat exchange device 300 switches to state five, thereby further enhancing the heating effect on the battery cell 100 .

[0084] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, the first surface 101 is the lower surface of the battery cell 100 , and the second surface 102 is the upper surface of the battery cell 100 .

[0085] Specifically, since the lower surface of the battery cell 100 is usually located at the bottom of the vehicle, it is convenient to arrange the heat dissipation fins 20 . When the vehicle is driving, the high-speed airflow at the bottom of the vehicle can blow onto the heat dissipation fins 20 .

[0086] Furthermore, since the upper surface of the battery cell 100 is usually located under the vehicle floor or directly serves as the vehicle floor, the second heat exchange device 300 is disposed on the upper surface of the battery cell 100. When the battery cell 100 is heated, the heat transfer to the outside of the vehicle can be reduced, thereby improving the heating effect of the battery cell 100.

[0087] Therefore, preferably, in this embodiment, the first surface 101 is selected as the lower surface of the battery cell 100, that is, the surface facing the outside of the vehicle, and the second surface 102 is selected as the upper surface of the battery cell 100, that is, the surface facing the inside of the vehicle.

[0088] In some embodiments not shown, those skilled in the art can flexibly adjust the locations of the first heat exchange device 200 and the second heat exchange device 300 according to actual needs. For example, one of the first surface 101 and the second surface 102 is the top surface of the battery cell 100, and the other is the side surface of the battery cell 100; or one of the first surface 101 and the second surface 102 is the bottom surface of the battery cell 100, and the other is the side surface of the battery cell 100; or one of the first surface 101 and the second surface 102 is the side surface of the battery cell 100, and the two can be adjacent sides or opposite sides.

[0089] like Figure 2 As shown, in the technical solution of this embodiment, the battery pack also includes a medium inlet pipe 400 and a medium outlet pipe 500, the upstream end of the first heat exchange pipeline 10 and the upstream end of the second heat exchange pipeline 301 are both connected to the medium inlet pipe 400, and the downstream end of the first heat exchange pipeline 10 and the downstream end of the second heat exchange pipeline 301 are both connected to the medium outlet pipe 500.

[0090] Specifically, the heat exchange medium flows in from the medium inlet pipe 400 , and selectively flows into the first heat exchange device 200 or the second heat exchange device 300 according to the opening and closing conditions of the first switch structure 30 and the second switch structure 302 , and the heat exchange medium finally flows out from the medium outlet pipe 500 .

[0091] Optionally, the heat exchange medium in this embodiment is a coolant, and the coolant can be a low-temperature coolant or a high-temperature coolant according to heat exchange requirements.

[0092] When the battery cell 100 has no heat exchange requirement, the first switch structure 30 and the second switch structure 302 are both in a closed state.

[0093] When the battery cell 100 needs to be cooled, the first switch structure 30 is opened and the second switch structure 302 is closed, and the low-temperature coolant flows into the first heat exchange device 200. And according to the strength of the cooling demand of the battery cell 100, the first heat exchange device 200 can be switched to state one or state two.

[0094] When the battery cell 100 needs to be heated, the second switch structure 302 is turned on, and the first switch structure 30 is turned off, and the high-temperature coolant flows into the second heat exchange device 300. And according to the intensity of the heating demand of the battery cell 100, the second heat exchange device 300 can be switched to state four or state five.

[0095] In addition, when the battery cell 100 is heated, the first heat exchange device 200 needs to be switched to state one, so as to prevent the heat obtained by the battery cell 100 from the second heat exchange device 300 from being dissipated by the heat dissipation fins 20 .

[0096] Optionally, for the first pumping structure 40 and the second pumping structure 303 , since the first pumping structure 40 also has the function of evacuating the first heat exchange section 11 , the power of the first pumping structure 40 can be selected to be greater than the power of the second pumping structure 303 .

[0097] like Figure 3 As shown, the present application also provides a heat exchange method for a battery pack, the battery pack is the above-mentioned battery pack, and an embodiment of the heat exchange method for a battery pack according to the present application includes:

[0098] S10: Determine whether the battery cell 100 needs to be cooled or heated;

[0099] S20: If it is determined that the battery cell 100 needs to be cooled, the second switch structure 302 and the second pumping structure 303 are closed, the first switch structure 30 is opened, and the first pumping structure 40 is started to allow the heat exchange medium to enter the first heat exchange section 11;

[0100] If it is determined in S30 that the battery cell 100 needs to be heated, the first switch structure 30 is closed, the first pumping structure 40 is started to form a vacuum in the first heat exchange section 11, the second switch structure 302 is opened, and the second pumping structure 303 is started to allow the heat exchange medium to enter the second heat exchange section 3011.

[0101] Specifically, in the above step S10, it is first necessary to determine whether the battery cell 100 has cooling or heating requirements. If the battery cell 100 has neither cooling nor heating requirements, the first switch structure 30 and the second switch structure 302 are both in the closed state. In addition, the first heat exchange device 200 needs to be switched to state 1 to prevent the heat of the battery cell 100 from being dissipated through air cooling, causing the temperature of the battery cell 100 to drop.

[0102] Furthermore, in the above step S20, if the result of the judgment in step S10 is that the battery cell 100 needs to be cooled, the second switch structure 302 and the second pumping structure 303 are closed at this time, that is, the low-temperature coolant cannot flow into the second heat exchange device 300. And the first switch structure 30 is opened, and the first pumping structure 40 is started to allow the low-temperature coolant to enter the first heat exchange section 11. According to the degree of cooling demand of the battery cell 100 (low demand or high demand), the first heat exchange device 200 can be controlled to switch to state two or state three.

[0103] Furthermore, in the above step S30, if the result of the judgment in step S10 is that the battery cell 100 needs to be heated, the first switch structure 30 needs to be closed, and the first pumping structure 40 needs to be started to form a vacuum in the first heat exchange section 11, that is, the first heat exchange device 200 needs to be switched to state 1, and the high-temperature coolant cannot flow into the first heat exchange device 200. In addition, the second switch structure 302 needs to be opened, and the second pumping structure 303 needs to be started to allow the high-temperature coolant to enter the second heat exchange section 3011. According to the degree of heating demand of the battery cell 100 (low demand or high demand), the second heat exchange device 300 can be controlled to switch to state 4 or state 5.

[0104] In addition, if the judgment result of step S10 is that the battery cell 100 has neither cooling demand nor heating demand, it is necessary to repeat step S10 for judgment within a predetermined interval to prevent the situation where the temperature of the battery cell 100 rises or falls and there is no timely response to the cooling or heating demand of the battery cell 100, resulting in the temperature of the battery cell 100 continuing to rise or fall.

[0105] Furthermore, those skilled in the art can set the above-mentioned interval duration according to actual needs.

[0106] like Figure 4 As shown, in the technical solution of this embodiment, the above step S10, i.e., determining whether the battery cell 100 needs to be cooled or heated, includes:

[0107] S11: Get the ambient temperature;

[0108] S12: If the ambient temperature is greater than the first preset value, it is determined that the battery cell 100 needs to be cooled;

[0109] S13: If the ambient temperature is lower than the second preset value, it is determined that the battery cell 100 needs to be heated.

[0110] Specifically, in step S11, it is necessary to obtain the ambient temperature outside the battery cell 100, that is, the ambient temperature of the vehicle. The ambient temperature in step S11 can be measured by a temperature sensor.

[0111] In step S12 and step S13, the ambient temperature needs to be compared with the first preset value and the second preset value to determine whether the current ambient temperature is moderate, high, or low, so as to determine whether the battery cell 100 needs to be cooled or heated in the current environment.

[0112] Specifically, in step S12, if the ambient temperature is greater than the first preset value, it means that the ambient temperature is too high, and the battery cell 100 will cause the temperature to rise when operating in this environment, so there is a need for cooling.

[0113] Specifically, in step S13, if the ambient temperature is less than the second preset value, it means that the ambient temperature is low, and the battery cell 100 will cause the temperature to drop when operating in this environment, so there is a need for heating.

[0114] Optionally, the first preset value and the second preset value may be the historical temperature data of the area where the vehicle is located in the same period. The historical temperature data of different areas may be different, and the vehicle controller may retrieve and download it on the Internet. The first preset value may be the highest temperature of the area where the vehicle is located in the same period, and the second preset value may be the lowest temperature of the area where the vehicle is located in the same period. Alternatively, the vehicle controller may retrieve and download the average temperature of the area where the vehicle is located in the same period on the Internet. In this case, the first preset value and the second preset value may be equal, and both are the average temperature of the same period.

[0115] Optionally, the first preset value and the second preset value mentioned above may also be pre-stored in a storage device of the vehicle, that is, the first preset value and the second preset value are pre-set values.

[0116] Optionally, the first preset value and the second preset value mentioned above may also be values ​​input into the storage by the occupant, that is, the first preset value and the second preset value are occupant input parameters.

[0117] Furthermore, if the ambient temperature is between the second preset value and the first preset value after judging through step S11, step S12 and step S13, it means that the ambient temperature is moderate at this time, and the battery cell 100 does not need to be cooled or heated.

[0118] Furthermore, if the ambient temperature is between the second preset value and the first preset value after judging through step S11, step S12 and step S13, it is necessary to repeat step S11, step S12 and step S13 for judgment within a predetermined interval to prevent the situation where the ambient temperature rises or falls and there is no timely response to the cooling or heating needs of the battery cell 100, resulting in the temperature of the battery cell 100 continuing to rise or fall.

[0119] Furthermore, those skilled in the art can set the above-mentioned interval duration according to actual needs.

[0120] like Figure 5 As shown, in the technical solution of this embodiment, the above step S10, i.e., determining whether the battery cell 100 needs to be cooled or heated, further includes:

[0121] S121: If the ambient temperature is greater than the first preset value and an instruction from the passenger to cool the battery pack is received, it is determined that the battery cell 100 needs to be cooled;

[0122] S131: If the ambient temperature is lower than the second preset value and an instruction from the passenger to heat the battery pack is received, it is determined that the battery cell 100 needs to be heated.

[0123] Specifically, in this embodiment, before determining that the battery cell 100 needs to be cooled or heated, it is necessary to inquire the occupant, and only after obtaining the occupant's cooling instruction or heating instruction, it is determined that the battery cell 100 needs to be cooled or heated.

[0124] In step S12 and step S121, if it is determined that the ambient temperature is greater than the first preset value, it is necessary to inquire the occupant whether the battery cell 100 needs to be cooled. If the occupant issues an instruction to cool the battery cell 100, it is determined that the battery cell 100 needs to be cooled. If the occupant issues an instruction not to cool the battery cell 100, it is determined that the battery cell 100 does not need to be cooled.

[0125] In step S13 and step S131, if it is determined that the ambient temperature is less than the second preset value, it is necessary to inquire the occupant whether the battery cell 100 needs to be heated. If the occupant issues an instruction to heat the battery cell 100, it is determined that the battery cell 100 needs to be heated. If the occupant issues an instruction not to heat the battery cell 100, it is determined that the battery cell 100 does not need to be heated.

[0126] Optionally, the above-mentioned method of asking the occupants may be to display information on the dashboard or screen, and the method of receiving the customer's instruction may be manual input by the occupants (selecting a graphic button of yes or no). The above-mentioned method of asking the occupants may also be voice broadcast, and the method of receiving the customer's instruction may be voice input by the occupants, and the vehicle controller analyzes the voice signal of the occupants to determine the specific content of the voice instruction issued by the occupants.

[0127] Of course, in the heat exchange method of this embodiment, after determining the difference between the ambient temperature and the first preset value and the second preset value, it is also possible to directly determine whether the battery cell 100 needs to be cooled or heated (that is, Figure 4 This is also a feasible implementation method.

[0128] For example, after determining that the ambient temperature is greater than the first preset value, it is possible to directly determine that the battery cell 100 needs to be cooled without asking the occupant whether the battery cell 100 needs to be cooled.

[0129] For example, after determining that the ambient temperature is less than the second preset value, it is possible to directly determine that the battery cell 100 does not need to be heated without asking the occupant whether the battery cell 100 needs to be heated.

[0130] like Figure 6As shown, in the technical solution of this embodiment, the above step S20, that is, if it is determined that the battery cell 100 needs to be cooled, the second switch structure 302 and the second pumping structure 303 are closed, the first switch structure 30 is opened, and the first pumping structure 40 is started to allow the heat exchange medium to enter the first heat exchange section 11, includes:

[0131] S21: Get the battery cell temperature;

[0132] S22: If the ambient temperature is greater than the first preset value and the battery core temperature is less than the third preset value, after the heat exchange medium fills the first heat exchange section 11, the first switch structure 30 is closed, and the first pumping structure 40 is closed.

[0133] Specifically, in step S21, the cell temperature needs to be obtained to determine the cooling requirement of the cell 100. Temperature sensors can be provided for the multiple batteries in the cell 100, and the cell temperature can be the temperature value of the battery with the highest temperature or the average temperature value of the multiple batteries. How to obtain the specific value of the cell temperature can be determined by those skilled in the art according to actual needs.

[0134] In step S22 , if the ambient temperature is greater than the first preset value, but the battery cell temperature is less than the third preset value, it means that although the ambient temperature is high, the battery cell 100 is not at a high temperature level, that is, the battery cell 100 has a low cooling requirement.

[0135] Therefore, in step S22, if the battery cell temperature is less than the third preset value, after the heat exchange medium fills the first heat exchange section 11, the first switch structure 30 is closed, and the first pumping structure 40 is closed. That is, the first heat exchange device 200 is switched to state 2, and the battery cell 100 is cooled only by air cooling, which can meet the heat dissipation requirements of the battery cell 100 without increasing the energy consumption burden of the vehicle.

[0136] like Figure 6 As shown, in the technical solution of this embodiment, the above step S20, that is, if it is determined that the battery cell 100 needs to be cooled, the second switch structure 302 and the second pumping structure 303 are closed, the first switch structure 30 is opened, and the first pumping structure 40 is started to allow the heat exchange medium to enter the first heat exchange section 11, further includes:

[0137] S23 : if the ambient temperature is greater than the first preset value and the battery core temperature is greater than the third preset value, the first switch structure 30 is turned on and the first pumping structure 40 is started to allow the heat exchange medium to continue to flow through the first heat exchange section 11 .

[0138] In step S23 , if the ambient temperature is greater than the first preset value and the battery cell temperature is greater than the third preset value, it means that the ambient temperature is high and the battery cell 100 is at a relatively high temperature level, that is, the battery cell 100 has a relatively high cooling requirement.

[0139] Therefore, in step S23, if the battery cell temperature is greater than the third preset value, the first switch structure 30 is turned on, and the first pumping structure 40 is started, so that the heat exchange medium continues to flow through the first heat exchange section 11. That is, the first heat exchange device 200 is switched to the third state, and the battery cell 100 is cooled by air cooling and liquid cooling, thereby improving the cooling effect of the battery cell 100. Moreover, under the condition of the same heat load, the combined cooling method of liquid cooling and air cooling can maintain the battery performance with less energy compared with the single liquid cooling method, thereby reducing the energy consumption of the whole vehicle.

[0140] Furthermore, when performing step S22 and step S23 , it is also necessary to determine the temperature of the battery cell within a predetermined time interval, so as to determine the real-time status of the battery cell 100 .

[0141] For example, when performing step S22, if it is determined that the battery cell temperature rises to a value greater than the third preset value, it means that the battery cell temperature continues to rise and is already at a relatively high level, and at this time, air cooling alone can no longer meet the heat dissipation requirements of the battery cell 100. At this time, the process should be switched to step S23, that is, the battery cell 100 is strongly cooled by air cooling plus liquid cooling, so that the battery cell temperature drops to a reasonable range as soon as possible.

[0142] For another example, when performing step S23, if it is determined that the battery cell temperature drops to less than the third preset value, it means that the battery cell temperature has dropped to a relatively low level and no strong cooling is required. At this time, the process should be switched to step S22, that is, the battery performance can be maintained only by air cooling, and the battery cell 100 can be prevented from being overcooled to affect its performance, and the energy consumption of the whole vehicle can also be prevented from increasing.

[0143] Furthermore, those skilled in the art can set the above-mentioned interval duration according to actual needs.

[0144] like Figure 7 As shown, in the technical solution of this embodiment, the above step S30, that is, if it is determined that the battery cell 100 needs to be heated, the first switch structure 30 is closed, the first pumping structure 40 is started to form a vacuum in the first heat exchange section 11, the second switch structure 302 is opened, and the second pumping structure 303 is started to allow the heat exchange medium to enter the second heat exchange section 3011, includes:

[0145] S31: Obtaining the battery cell temperature;

[0146] S32: If the ambient temperature is lower than the second preset value and the battery core temperature is higher than the fourth preset value, after the heat exchange medium fills the second heat exchange section 3011, the second pumping structure 303 is closed.

[0147] Specifically, the cell temperature also needs to be obtained in step S31. The method of obtaining the cell temperature in step S31 is basically the same as that in step S21. The difference is that in step S31, the cell temperature can be the temperature value of the battery with the lowest temperature or the average temperature of multiple batteries. Of course, how to obtain the specific value of the cell temperature can be determined by those skilled in the art according to actual needs.

[0148] In step S32 , if the ambient temperature is lower than the second preset value, but the battery cell temperature is higher than the fourth preset value, it means that although the ambient temperature is low, the battery cell 100 is not at a relatively low temperature level, that is, the battery cell 100 has a relatively low heating requirement.

[0149] Therefore, in step S32, if the ambient temperature is less than the second preset value and the battery core temperature is greater than the fourth preset value, the heat exchange medium fills the second heat exchange section 3011 and then closes the second pumping structure 303. That is, the second heat exchange device 300 is switched to state 4, and the heating demand of the battery core 100 can be met by heat conduction of the high-temperature coolant.

[0150] like Figure 7 As shown, in the above step S30, if it is determined that the battery cell 100 needs to be heated, the first switch structure 30 is closed, the first pumping structure 40 is started to form a vacuum in the first heat exchange section 11, the second switch structure 302 is opened, and the second pumping structure 303 is started to allow the heat exchange medium to enter the second heat exchange section 3011, and the following steps are also included:

[0151] S33 : if the ambient temperature is lower than the second preset value and the battery core temperature is lower than the fourth preset value, the second pumping structure 303 is turned on to allow the heat exchange medium to continue to flow through the second heat exchange section 3011 .

[0152] In step S33 , if the ambient temperature is less than the second preset value and the battery cell temperature is also less than the fourth preset value, it means that the ambient temperature is low and the battery cell 100 is also at a relatively low temperature level, that is, the battery cell 100 has a higher heating requirement.

[0153] Therefore, in step S32, when the ambient temperature is lower than the second preset value and the battery cell temperature is lower than the fourth preset value, the second pumping structure 303 is turned on to allow the heat exchange medium to continue to flow through the second heat exchange section 3011. That is, when the second heat exchange device 300 is switched to the fifth state, the high-temperature coolant continues to flow through the second heat exchange section 3011, thereby improving the heating effect on the battery cell 100 and allowing the battery pack temperature to return to a reasonable temperature range as soon as possible.

[0154] Furthermore, when performing step S32 and step S33 , it is also necessary to determine the temperature of the battery cell within a predetermined time interval, so as to determine the real-time status of the battery cell 100 .

[0155] For example, when performing step S32, if it is determined that the battery cell temperature drops to less than the fourth preset value, it means that the battery cell temperature continues to drop and is already at a relatively low level. At this time, the heat conduction of the high-temperature coolant alone cannot meet the heating demand of the battery cell 100. At this time, the process should switch to step S33, that is, the high-temperature coolant continuously flows through the second heat exchange section 3011 to achieve strong heating of the battery cell 100, so that the battery cell temperature returns to a reasonable range as soon as possible.

[0156] For another example, when performing step S33, if it is determined that the battery cell temperature rises to a value greater than the fourth preset value, it means that the battery cell temperature has risen to a relatively high level and no strong heating is required. At this time, the process should switch to step S32, that is, the battery performance can be maintained only by heat conduction of the high-temperature coolant, and the battery cell 100 can be prevented from being overheated and affecting its performance, and the energy consumption of the whole vehicle can also be prevented from increasing.

[0157] Furthermore, those skilled in the art can set the above-mentioned interval duration according to actual needs.

[0158] The present application also provides a vehicle, comprising the above-mentioned battery pack.

[0159] Optionally, the vehicle is a new energy vehicle.

[0160] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A heat exchange device for a battery pack, characterized in that: include: A first heat exchange pipeline (10) comprises a first heat exchange section (11), wherein one side of the first heat exchange section (11) is used for contacting and cooperating with the battery core (100); A heat dissipation fin (20) is in contact with and cooperates with the other side of the first heat exchange section (11); A first switch structure (30) and a first pumping structure (40) are arranged on the first heat exchange pipeline (10).

2. The heat exchange device according to claim 1, characterized in that: The first switch structure (30) is located at an upstream position of the first heat exchange section (11), and the first pumping structure (40) is located at a downstream position of the first heat exchange section (11).

3. The heat exchange device according to claim 1, characterized in that: It also comprises a heat insulation layer (50), the heat insulation layer (50) is coated on the outside of the first heat exchange section (11), and the heat insulation layer (50) is in contact with the battery core (100).

4. The heat exchange device according to claim 1, characterized in that: The first heat exchange section (11) comprises a plurality of first branch pipes (111) arranged in parallel, and the heat dissipation fins (20) are arranged at least at some of the first branch pipes (111).

5. The heat exchange device according to claim 1, characterized in that: The first heat exchange section (11) is made of plastic material.

6. A battery pack, characterized in that: include: Battery cell (100); A first heat exchange device (200) is arranged on the first surface (101) of the battery core (100), wherein the first heat exchange device (200) comprises the heat exchange device according to any one of claims 1 to 5; A second heat exchange device (300) is arranged on the second surface (102) of the battery cell (100), the second heat exchange device (300) comprises a second heat exchange pipeline (301), a second switch structure (302) and a second pumping structure (303), the second heat exchange pipeline (301) comprises a second heat exchange section (3011), the second heat exchange section (3011) is used for contacting and cooperating with the battery cell (100), the second switch structure (302) and the second pumping structure (303) are both arranged on the second heat exchange pipeline (301), the second switch structure (302) is located at an upstream position of the second heat exchange section (3011), and the second pumping structure (303) is located at a downstream position of the second heat exchange section (3011).

7. The battery pack according to claim 6, characterized in that: The first surface (101) is the surface of the battery cell (100) facing the outside of the vehicle, and the second surface (102) is the surface of the battery cell (100) facing the inside of the vehicle.

8. The battery pack according to claim 6, characterized in that: The battery pack further comprises a medium inlet pipe (400) and a medium outlet pipe (500), the upstream end of the first heat exchange pipeline (10) and the upstream end of the second heat exchange pipeline (301) are both connected to the medium inlet pipe (400), and the downstream end of the first heat exchange pipeline (10) and the downstream end of the second heat exchange pipeline (301) are both connected to the medium outlet pipe (500).

9. A heat exchange method for a battery pack, characterized in that: The battery pack is a battery pack according to any one of claims 6 to 8, and the heat exchange method comprises: Determining whether the battery cell (100) needs to be cooled or heated; If it is determined that the battery cell (100) needs to be cooled, the second switch structure (302) and the second pumping structure (303) are closed, the first switch structure (30) is opened, and the first pumping structure (40) is started to allow the heat exchange medium to enter the first heat exchange section (11); If it is determined that the battery cell (100) needs to be heated, the first switch structure (30) is closed, the first pumping structure (40) is started to form a vacuum in the first heat exchange section (11), the second switch structure (302) is opened, and the second pumping structure (303) is started to allow the heat exchange medium to enter the second heat exchange section (3011).

10. The heat exchange method according to claim 9, characterized in that: The determining whether the battery cell (100) needs to be cooled or heated comprises: Get the ambient temperature; If the ambient temperature is greater than a first preset value, determining that the battery cell (100) needs to be cooled; If the ambient temperature is lower than a second preset value, it is determined that the battery cell (100) needs to be heated.

11. The heat exchange method according to claim 10, characterized in that: The determining whether the battery cell (100) needs to be cooled or heated also includes: If the ambient temperature is greater than a first preset value and an instruction from an occupant to cool the battery pack is received, it is determined that the battery cell (100) needs to be cooled; If the ambient temperature is lower than a second preset value and an instruction from an occupant to heat the battery pack is received, it is determined that the battery cell (100) needs to be heated.

12. The heat exchange method according to claim 10, characterized in that: If it is determined that the battery cell (100) needs to be cooled, closing the second switch structure (302) and the second pumping structure (303), opening the first switch structure (30), and starting the first pumping structure (40) to allow the heat exchange medium to enter the first heat exchange section (11) comprises: Get the battery cell temperature; If the ambient temperature is greater than a first preset value and the battery core temperature is less than a third preset value, after the heat exchange medium fills the first heat exchange section (11), the first switch structure (30) is closed and the first pumping structure (40) is closed.

13. The heat exchange method according to claim 12, characterized in that: If it is determined that the battery cell (100) needs to be cooled, the second switch structure (302) and the second pumping structure (303) are closed, the first switch structure (30) is opened, and the first pumping structure (40) is started to allow the heat exchange medium to enter the first heat exchange section (11), and the method further includes: If the ambient temperature is greater than a first preset value and the battery core temperature is greater than a third preset value, the first switch structure (30) is opened and the first pumping structure (40) is started to allow the heat exchange medium to continue to flow through the first heat exchange section (11).

14. The heat exchange method according to claim 10, characterized in that: If it is determined that the battery cell (100) needs to be heated, closing the first switch structure (30), starting the first pumping structure (40) to form a vacuum in the first heat exchange section (11), opening the second switch structure (302), and starting the second pumping structure (303) to allow the heat exchange medium to enter the second heat exchange section (3011) comprises: Get the battery cell temperature; If the ambient temperature is lower than the second preset value and the battery core temperature is higher than the fourth preset value, the second pumping structure (303) is closed after the heat exchange medium fills the second heat exchange section (3011).

15. The heat exchange method according to claim 14, characterized in that: If it is determined that the battery cell (100) needs to be heated, the first switch structure (30) is closed, the first pumping structure (40) is started to form a vacuum in the first heat exchange section (11), the second switch structure (302) is opened, and the second pumping structure (303) is started to allow the heat exchange medium to enter the second heat exchange section (3011), and the method further includes: If the ambient temperature is lower than a second preset value, and the battery core temperature is lower than a fourth preset value, the second pumping structure (303) is turned on to allow the heat exchange medium to continue to flow through the second heat exchange section (3011).

16. A vehicle, characterized in that: A battery pack comprising any one of claims 6 to 8.

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